Asterisks are not allowed in tags, but this artist's username is made of 3 Asterisks.
Post is https://e621.net/posts/4699526
Pixiv Username is ***
See https://www.pixiv.net/en/users/84771202

Your username is how I feel about that username. Uhh, how about asterisk_asterisk_asterisk?

ban that artist from ever being posted here, problem solved

Their linked twitter has the infinitely more pronounceable Raggron as their handle. Without any better option, my vote's for that.